US10722690B2 - Medical devices with antithrombogenic coatings - Google Patents

Medical devices with antithrombogenic coatings Download PDF

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Publication number
US10722690B2
US10722690B2 US15/389,420 US201615389420A US10722690B2 US 10722690 B2 US10722690 B2 US 10722690B2 US 201615389420 A US201615389420 A US 201615389420A US 10722690 B2 US10722690 B2 US 10722690B2
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Prior art keywords
distal portion
region
tubular member
slots
pressure sensing
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US15/389,420
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US20170182295A1 (en
Inventor
Roger W. McGowan
Brice Lee Shireman
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Boston Scientific Scimed Inc
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Scimed Life Systems Inc
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Assigned to BOSTON SCIENTIFIC SCIMED, INC reassignment BOSTON SCIENTIFIC SCIMED, INC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MCGOWAN, ROGER W., SHIREMAN, BRICE LEE
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/09—Guide wires
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
    • A61B5/6851—Guide wires
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/0215—Measuring pressure in heart or blood vessels by means inserted into the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/0215—Measuring pressure in heart or blood vessels by means inserted into the body
    • A61B5/02154—Measuring pressure in heart or blood vessels by means inserted into the body by optical transmission
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/09—Guide wires
    • A61M2025/09133—Guide wires having specific material compositions or coatings; Materials with specific mechanical behaviours, e.g. stiffness, strength to transmit torque
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/09—Guide wires
    • A61M2025/09175—Guide wires having specific characteristics at the distal tip
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2202/00—Special media to be introduced, removed or treated
    • A61M2202/04—Liquids
    • A61M2202/0468—Liquids non-physiological
    • A61M2202/0478—Heparin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3331—Pressure; Flow
    • A61M2205/3344—Measuring or controlling pressure at the body treatment site

Definitions

  • the present disclosure pertains to medical devices, and methods for manufacturing medical devices. More particularly, the present disclosure pertains to blood pressure sensing guidewires.
  • intracorporeal medical devices have been developed for medical use, for example, intravascular use. Some of these devices include guidewires, catheters, and the like. These devices are manufactured by any one of a variety of different manufacturing methods and may be used according to any one of a variety of methods. Of the known medical devices and methods, each has certain advantages and disadvantages. There is an ongoing need to provide alternative medical devices as well as alternative methods for manufacturing and using medical devices.
  • This disclosure provides design, material, manufacturing method, and use alternatives for medical devices.
  • a pressure sensing guidewire may comprise a tubular member having a proximal portion and a distal portion, wherein the distal portion may have a plurality of slots formed therein.
  • the distal portion may have a first wall thickness along a first region and a second wall thickness smaller than the first wall thickness along a second region.
  • the pressure sensing guidewire may further comprise a pressure sensor disposed within the distal portion of the tubular member and housed within the second region and an anti-thrombogenic coating disposed on an inner surface, an outer surface, or both of the second region of the distal portion of the tubular member.
  • the anti-thrombogenic coating may comprise a hydrophilic coating.
  • the hydrophilic coating may comprise a heparinized hydrophilic coating.
  • the anti-thrombogenic coating may comprise a hydrophobic coating.
  • the hydrophobic coating may comprise silicone.
  • the hydrophobic coating may be disposed on the pressure sensor.
  • the pressure sensing guidewire may further comprise one or more apertures formed in the second region of the distal portion.
  • the second region of the distal portion may be free from the plurality of slots.
  • the pressure sensor may be positioned proximal to the one or more apertures.
  • the anti-thrombogenic coating may extend at least partially along a sidewall of the one or more apertures.
  • the second region of the distal portion may include at least one of the plurality of slots formed therein.
  • the anti-thrombogenic coating may extend at least partially along a sidewall of the at least one of the plurality of slots.
  • the anti-thrombogenic coating may extend along an entire length of a sidewall of the at least one of the plurality of slots.
  • the pressure sensor may be an optical pressure sensor.
  • the first region of the distal portion may be disposed proximal to the second region of the distal portion.
  • a pressure sensing guidewire may comprise a tubular member having a proximal portion and a distal portion, wherein the distal portion may have a plurality of slots formed therein.
  • the distal portion may have a first wall thickness along a first region and a second wall thickness smaller than the first wall thickness along a second region.
  • the pressure sensing guidewire may further comprise a pressure sensor disposed within the distal portion of the tubular member and housed within the second region and an anti-thrombogenic coating disposed on an inner surface of the second region of the distal portion of the tubular member.
  • the anti-thrombogenic coating may comprise a hydrophilic coating.
  • the hydrophilic coating may comprise a heparinized hydrophilic coating.
  • the anti-thrombogenic coating may comprise a hydrophobic coating.
  • the hydrophobic coating may comprise silicone.
  • hydrophobic coating may be disposed on the pressure sensor.
  • the first region of the distal portion may be disposed proximal to the second region of the distal portion.
  • the pressure sensing guidewire may further comprise one or more apertures formed in the second region of the distal portion.
  • the second region of the distal portion may be free from the plurality of slots.
  • the pressure sensor may be positioned proximal to the one or more apertures.
  • a pressure sensing guidewire may comprise a tubular member having a proximal portion and a distal portion, wherein the distal portion has a plurality of slots formed therein.
  • the distal portion may have a first wall thickness along a first region and a second wall thickness smaller than the first wall thickness along a second region.
  • the pressure sensing guidewire may further comprise a pressure sensor disposed within the distal portion of the tubular member and housed within the second region and an anti-thrombogenic coating disposed on an outer surface of the second region of the distal portion of the tubular member.
  • the anti-thrombogenic coating may comprise a hydrophilic coating.
  • the hydrophilic coating may comprise a heparinized hydrophilic coating.
  • the anti-thrombogenic coating may comprise a hydrophobic coating.
  • the hydrophobic coating may comprise silicone.
  • the hydrophobic coating may be disposed on the pressure sensor.
  • the first region of the distal portion may be disposed proximal to the second region of the distal portion.
  • a pressure sensing guidewire may comprise a tubular member having a proximal portion and a distal portion, wherein the distal portion has a plurality of slots formed therein.
  • the distal portion may have a first wall thickness along a first region and a second wall thickness smaller than the first wall thickness along a second region.
  • the pressure sensing guidewire may further comprise a pressure sensor disposed within the distal portion of the tubular member and housed within the second region and an anti-thrombogenic coating disposed on an inner surface and an outer surface of the second region of the distal portion of the tubular member.
  • the anti-thrombogenic coating may comprise a heparinized hydrophilic coating.
  • the anti-thrombogenic coating may comprise silicone.
  • FIG. 1 is a partial cross-sectional side view of a portion of an example medical device.
  • FIGS. 1A-1C are close up partial cross-sectional side views of a portion of the example medical device of FIG. 1 .
  • FIG. 2 is a partial cross-sectional view of an example medical device disposed at a first position adjacent to an intravascular occlusion.
  • FIG. 3 is a partial cross-sectional view of an example medical device disposed at a second position adjacent to an intravascular occlusion.
  • FIG. 4 is a partial cross-sectional side view of a portion of another example medical device.
  • references in the specification to “an embodiment”, “some embodiments”, “other embodiments”, etc. indicate that the embodiment described may include one or more particular features, structures, and/or characteristics. However, such recitations do not necessarily mean that all embodiments include the particular features, structures, and/or characteristics. Additionally, when particular features, structures, and/or characteristics are described in connection with one embodiment, it should be understood that such features, structures, and/or characteristics may also be used connection with other embodiments whether or not explicitly described unless clearly stated to the contrary.
  • FFR fractional flow reserve
  • FIG. 1 illustrates a portion of an example medical device 10 .
  • medical device 10 is a blood pressure sensing guidewire 10 .
  • Guidewire 10 may include a tubular member or shaft 12 .
  • Shaft 12 may include a proximal portion 14 and a distal portion 16 .
  • the materials for proximal portion 14 and distal portion 16 may vary and may include those materials disclosed herein.
  • distal portion 16 , proximal portion 14 , or both may include a nickel-cobalt-chromium-molybdenum alloy (e.g., MP35-N), stainless steel, a nickel-titanium alloy (e.g., nitinol), combinations thereof, or other suitable materials including those materials disclosed herein. These are just examples. Other materials may also be utilized.
  • a nickel-cobalt-chromium-molybdenum alloy e.g., MP35-N
  • stainless steel e.g., a nickel-titanium alloy (e.g., nitinol), combinations thereof, or other suitable materials including those materials disclosed herein.
  • nickel-titanium alloy e.g., nitinol
  • proximal portion 14 and distal portion 16 are formed from the same monolith of material. In other words, proximal portion 14 and distal portion 16 are portions of the same tube defining shaft 12 . In other embodiments, proximal portion 14 and distal portion 16 are separate tubular members that are joined together. For example, a section of the outer surface of portions 14 / 16 may be removed and a sleeve 17 may be disposed over the removed sections to join portions 14 / 16 . Alternatively, sleeve 17 may be simply disposed over portions 14 / 16 . Other bonds may also be used including welds, thermal bonds, adhesive bonds, or the like.
  • sleeve 17 used to join proximal portion 14 with distal portion 16 may include a material that desirably bonds with both proximal portion 14 and distal portion 16 .
  • sleeve 17 may include a nickel-chromium-molybdenum alloy (e.g., INCONEL).
  • a plurality of slots 18 may be formed in tubular member 12 .
  • slots 18 are formed in distal portion 16 .
  • proximal portion 14 lacks slots 18 .
  • proximal portion 14 may include slots 18 .
  • Slots 18 may be desirable for a number of reasons. For example, slots 18 may provide a desirable level of flexibility to tubular member 12 (e.g., along distal portion 16 ) while also allowing suitable transmission of torque. Slots 18 may be arranged/distributed along distal portion 16 in a suitable manner including any of those arrangements disclosed herein. For example, slots 18 may be arranged as opposing pairs of slots 18 that are distributed along the length of distal portion 16 .
  • adjacent pairs of slots 18 may have a substantially constant spacing relative to one another.
  • the spacing between adjacent pairs may vary.
  • more distal regions of distal portion 16 may have a decreased spacing (and/or increased slot density), which may provide increased flexibility.
  • more distal regions of distal portion 16 may have an increased spacing (and/or decreased slot density).
  • a pressure sensor 20 may be disposed within tubular member 12 (e.g., within a lumen 22 of tubular member 12 ). While pressure sensor 20 is shown schematically in FIG. 1 , it can be appreciated that the structural form and/or type of pressure sensor 20 may vary.
  • pressure sensor 20 may include a semiconductor (e.g., silicon wafer) pressure sensor, piezoelectric pressure sensor, a fiber optic or optical pressure sensor, a Fabry-Perot type pressure sensor, an ultrasound transducer and/or ultrasound pressure sensor, a magnetic pressure sensor, a solid-state pressure sensor, or the like, or any other suitable pressure sensor.
  • pressure sensor 20 may include an optical pressure sensor.
  • a fiber optic cable 24 may be attached to pressure sensor 20 and may extend proximally therefrom.
  • An attachment member 26 may attach fiber optic cable 24 to tubular member 12 .
  • Attachment member 26 may be circumferentially disposed about and attached to optical fiber 24 and may be secured to the inner surface of tubular member 12 (e.g., distal portion 16 ).
  • attachment member 26 is proximally spaced from pressure sensor 20 .
  • a centering ring (not shown) may be disposed around optical fiber 24 at a position that is spaced proximally from optical pressure sensor 20 .
  • distal portion 16 may include a region with a thinned wall and/or an increased inner diameter that defines a housing region 52 .
  • the distal portion 16 may have a first wall thickness along a first region and a different second wall thickness along a second region.
  • housing region 52 is the region of distal portion 16 that ultimately “houses” the pressure sensor (e.g., pressure sensor 20 ).
  • pressure sensor 20 it may be desirable for pressure sensor 20 to have reduced exposure along its side surfaces to fluid pressure (e.g., from the blood). Accordingly, it may be desirable to position pressure sensor 20 along a landing region 50 defined along housing region 52 . Landing region 50 may be substantially free of slots 18 so that the side surfaces of pressure sensor 20 have a reduced likelihood of being deformed due to fluid pressures or pressure from landing region 50 at these locations. Distal of landing area 50 , housing region 52 may include slots 18 that provide fluid access to pressure sensor 20 .
  • slots 18 may define a fluid pathway that allows blood (and/or a body fluid) to flow from a position along the exterior or outer surface of guidewire 10 (and/or tubular member 12 ), through slots 18 , and into the lumen 22 of tubular member 12 , where the blood can come into contact with pressure sensor 20 . Because of this, no additional side openings/holes (e.g., other than slots 18 ) may be necessary in tubular member 12 for pressure measurement. This may also allow the length of distal portion 16 to be shorter than typical sensor mounts or hypotubes that would need to have a length sufficient for a suitable opening/hole (e.g., a suitable “large” opening/hole) to be formed therein that provides fluid access to sensor 20 .
  • a suitable opening/hole e.g., a suitable “large” opening/hole
  • blood flow through a vessel and/or along portions of a medical device may be reduced.
  • Either of these two scenarios could lead to coagulation of blood (e.g., formation of thrombus) including coagulation of blood along a portion of a medical device.
  • coagulation of blood and/or thrombus formation along medical device 10 may interfere with the sensing capability of pressure sensor 20 and/or lead to measurement drift.
  • It may be desirable to reduce the potential for blood coagulation and/or thrombus formation along medical device 10 including reducing the potential for blood coagulation and/or thrombus formation along lumen 22 ).
  • An anti-thrombogenic coating such as a hydrophobic or hydrophilic coating, may be disposed on the outer surface and/or inner surface of the housing region 52 to reduce thrombus formation in the lumen 22 and/or on an outer surface of the housing region 52 .
  • an inner layer 60 may be disposed on an inner surface of the housing region 52 and an outer layer 62 may be disposed on an outer surface of the housing region 52 .
  • the inner and outer layers 60 , 62 may extend proximally and/or distally of the housing region 52 , as desired. It is further contemplated that only one of the inner layer 60 or outer layer 62 may be present.
  • the inner layer 60 and the outer layer 62 may be formed of the same material or different materials, as desired.
  • the inner layer 60 and/or outer layer 62 may not extend into the slots 18 , as shown in FIG. 1A , such that the sidewalls of the slots 18 are free from the coating.
  • one or both of the inner and outer layers 60 , 62 may extend along the walls of the slots 18 such that a continuous coating covers all of the surfaces, including the sidewalls of the slots 18 of the housing region 52 , as shown in FIG. 1B .
  • one or both of the inner and outer layers 60 , 62 may extend partially into the slots 18 to partially coat the sidewalls of the slots, as shown in FIG. 1C . It is further contemplated that the coating may extend partially or fully along a length of the sidewalls of the slots 18 when only one of the inner or outer layers 60 , 62 are present.
  • the inner and/or outer layers 60 , 62 may be a medical grade hydrophobic silicone coating. It is contemplated that the coating 60 , 62 may be applied as a solution and subsequently cured.
  • the silicone solution may be a solution of MDX4 manufactured by DOW CORNING®, in the range of 2.5% to 5% MDX4 by weight. In other embodiments, the silicone solution may be a solution of approximately 7% MED-4159 manufactured by NuSil, by weight manufactured by NUSIL TECHNOLOGY. Other medical grade silicones are contemplated, as well as solution concentration of less than 2.5% and greater than 5% by weight. These are just examples. It is contemplated that the guidewire 10 may be assembled, dipped into the silicone solution, and subsequently cured in an oven. In some embodiments, the silicone solution may be applied to the entirety of the housing region 52 as well as the pressure sensor 20 .
  • the inner and/or outer layers 60 , 62 may be a hydrophilic coating.
  • the hydrophilic coating may additionally contain heparin to actively inhibit thrombus generation, although this is not required.
  • An illustrative heparinized hydrophilic coating may be product number 3477-87 available from SURMODICS. It is contemplated that the hydrophilic coating may be applied to the housing region 52 prior to installing the pressure sensor 20 . Once the hydrophilic coating has been applied, the hydrophilic coating may be cured with ultraviolet (UV) light. The pressure sensor 20 may be installed after curing the coating and the guidewire assembly completed.
  • UV ultraviolet
  • a tip member 30 may be coupled to distal portion 16 .
  • Tip member 30 may include a shaping member 32 and a spring or coil member 34 .
  • a distal tip 36 may be attached to shaping member 32 and/or spring 34 .
  • distal tip 36 may take the form of a solder ball tip.
  • Tip member 30 may be joined to distal portion 16 of tubular member 12 with a bonding member 46 such as a weld. It is contemplated that the tip member 30 may be coupled to the distal portion 16 before or after application of the hydrophobic or hydrophilic coating 60 , 62 , as desired.
  • Tubular member 12 may include a hydrophilic coating 19 .
  • hydrophilic coating 19 may extend along substantially the full length of tubular member 12 .
  • one or more discrete sections of tubular member 12 may include hydrophilic coating 19 .
  • a clinician may use guidewire 10 to measure and/or calculate FFR (e.g., the pressure after an intravascular occlusion relative to the pressure before the occlusion and/or the aortic pressure).
  • Measuring and/or calculating FFR may include measuring the aortic pressure in a patient. This may include advancing guidewire 10 through a blood vessel or body lumen 54 to a position that is proximal or upstream of an occlusion 56 as shown in FIG. 2 .
  • guidewire 10 may be advanced through a guide catheter 58 to a position where at least a portion of sensor 20 is disposed distal of the distal end of guide catheter 58 and measuring the pressure within body lumen 54 .
  • This pressure may be characterized as an initial pressure.
  • the aortic pressure may also be measured by another device (e.g., a pressure sensing guidewire, catheter, or the like).
  • the initial pressure may be equalized with the aortic pressure.
  • the initial pressure measured by guidewire 10 may be set to be the same as the measured aortic pressure.
  • Guidewire 10 may be further advanced to a position distal or downstream of occlusion 56 as shown in FIG. 3 and the pressure within body lumen 54 may be measured. This pressure may be characterized as the downstream or distal pressure.
  • the distal pressure and the aortic pressure may be used to calculate FFR.
  • FIG. 4 illustrates a portion of another example medical device 70 .
  • the medical device 70 is a blood pressure sensing guidewire 70 .
  • the guidewire 70 may be similar in form and function to the guidewire described above 10.
  • Guidewire 70 may include a tubular member or shaft 12 .
  • Shaft 12 may include a proximal portion 14 and a distal portion 16 .
  • proximal portion 14 and distal portion 16 are formed from the same monolith of material. In other words, proximal portion 14 and distal portion 16 are portions of the same tube defining shaft 12 . In other embodiments, proximal portion 14 and distal portion 16 are separate tubular members that are joined together. For example, a section of the outer surface of portions 14 / 16 may be removed and a sleeve 17 may be disposed over the removed sections to join portions 14 / 16 . Alternatively, sleeve 17 may be simply disposed over portions 14 / 16 . Other bonds may also be used including welds, thermal bonds, adhesive bonds, or the like. If utilized, sleeve 17 used to join proximal portion 14 with distal portion 16 may include a material that desirably bonds with both proximal portion 14 and distal portion 16 .
  • a plurality of slots 18 may be formed in tubular member 12 .
  • slots 18 are formed in distal portion 16 .
  • proximal portion 14 lacks slots 18 .
  • proximal portion 14 may include slots 18 .
  • Slots 18 may be desirable for a number of reasons. For example, slots 18 may provide a desirable level of flexibility to tubular member 12 (e.g., along distal portion 16 ) while also allowing suitable transmission of torque. Slots 18 may be arranged/distributed along distal portion 16 in a suitable manner including any of those arrangements disclosed herein. For example, slots 18 may be arranged as opposing pairs of slots 18 that are distributed along the length of distal portion 16 .
  • adjacent pairs of slots 18 may have a substantially constant spacing relative to one another.
  • the spacing between adjacent pairs may vary.
  • more distal regions of distal portion 16 may have a decreased spacing (and/or increased slot density), which may provide increased flexibility.
  • more distal regions of distal portion 16 may have an increased spacing (and/or decreased slot density).
  • a pressure sensor 20 may be disposed within tubular member 12 (e.g., within a lumen 22 of tubular member 12 ). While pressure sensor 20 is shown schematically in FIG. 4 , it can be appreciated that the structural form and/or type of pressure sensor 20 may vary.
  • pressure sensor 20 may include a semiconductor (e.g., silicon wafer) pressure sensor, piezoelectric pressure sensor, a fiber optic or optical pressure sensor, a Fabry-Perot type pressure sensor, an ultrasound transducer and/or ultrasound pressure sensor, a magnetic pressure sensor, a solid-state pressure sensor, or the like, or any other suitable pressure sensor.
  • pressure sensor 20 may include an optical pressure sensor.
  • a fiber optic cable 24 may be attached to pressure sensor 20 and may extend proximally therefrom.
  • An attachment member 26 may attach fiber optic cable 24 to tubular member 12 .
  • Attachment member 26 may be circumferentially disposed about and attached to optical fiber 24 and may be secured to the inner surface of tubular member 12 (e.g., distal portion 16 ).
  • attachment member 26 is proximally spaced from pressure sensor 20 .
  • a centering ring (not shown) may be disposed around optical fiber 24 at a position that is spaced proximally from optical pressure sensor 20 .
  • distal portion 16 may include a region with a thinned wall and/or an increased inner diameter that defines a housing region 52 .
  • housing region 52 is the region of distal portion 16 that ultimately “houses” the pressure sensor (e.g., pressure sensor 20 ).
  • the housing region 52 may include one or more apertures 72 in place of or in addition to slots 18 for allowing fluid to enter the lumen 22 and access to pressure sensor 20 .
  • the housing region 52 may be substantially free from apertures 72 and/or slots 18 in the region adjacent to the pressure sensor.
  • the apertures 72 may be uniformly spaced about a circumference of the housing region 52 .
  • the apertures 72 may be positioned approximately 180° from one another about the circumference and at a similar axial location, as shown in FIG. 4 . This is just an example.
  • the apertures 72 may be positioned at any circumferential and/or axial location desired. It is further contemplated that the apertures 72 need not be uniformly positioned about the circumference. In some instances, the apertures 72 may be eccentrically arranged.
  • the apertures 72 may take any shape desired, such as, but not limited to: circular, oval, square, rectangular, polygonal, etc.
  • blood flow through a vessel and/or along portions of a medical device may be reduced.
  • Either of these two scenarios could lead to coagulation of blood (e.g., formation of thrombus) including coagulation of blood along a portion of a medical device.
  • coagulation of blood and/or thrombus formation along medical device 70 may interfere with the sensing capability of pressure sensor 20 and/or lead to measurement drift.
  • It may be desirable to reduce the potential for blood coagulation and/or thrombus formation along medical device 70 including reducing the potential for blood coagulation and/or thrombus formation along lumen 22 ).
  • a hydrophobic or hydrophilic coating may be disposed on the outer surface and/or inner surface of the housing region 52 to reduce thrombus formation in the lumen 22 and/or on an outer surface of the housing region 52 .
  • an inner layer 74 may be disposed on an inner surface of the housing region 52 and an outer layer 76 may be disposed on an outer surface of the housing region 52 .
  • the inner and outer layers 74 , 76 may extend proximally and/or distally of the housing region 52 , as desired. It is further contemplated that only one of the inner layer 74 or outer layer 76 may be present.
  • the inner layer 74 and the outer layer 76 may be formed of the same material or different materials, as desired.
  • the inner layer 74 and/or outer layer 76 may not extend into the apertures 72 and/or slots 18 in similar to the embodiment shown in FIG. 1A , such that the apertures 72 and/or slots 18 are free from the coating.
  • one or both of the inner and outer layers 74 , 76 may extend along the walls of the apertures 72 and/or slots 18 such that a continuous coating covers all of the surfaces of the housing region 52 , similar to the embodiment shown in FIG. 1B .
  • one or both of the inner and outer layers 74 , 76 may extend partially into the apertures 72 and/or slots 18 , similar to the embodiment shown in FIG. 1C .
  • the inner and/or outer layers 74 , 76 may be a medical grade hydrophobic silicone coating. It is contemplated that the coating 74 , 76 may be applied as a solution and subsequently cured.
  • the silicone solution may be a solution of MDX4 manufactured by DOW CORNING®, in the range of 2.5% to 5% MDX4 by weight. In other embodiments, the silicone solution may be a solution of approximately 7% NuSil by weight manufactured by NUSIL TECHNOLOGY. Other medical grade silicones are contemplated, as well as solution concentrations of less than 2.5% and greater than 5% by weight. These are just examples. It is contemplated that the guidewire 70 may be assembled, dipped into the silicone solution, and subsequently cured in an oven. In some embodiments, the silicone solution may be applied to the entirety of the housing region 52 as well as the pressure sensor 20 .
  • the inner and/or outer layers 74 , 76 may be a hydrophilic coating.
  • the hydrophilic coating may additionally contain heparin to actively inhibit thrombus generation, although this is not required.
  • An illustrative heparinized hydrophilic coating may be product number 3477-87 available from SURMODICS. It is contemplated that the hydrophilic coating may be applied to the housing region 52 prior to installing the pressure sensor 20 . Once the hydrophilic coating has been applied, the hydrophilic coating may be cured with ultraviolet (UV) light. The pressure sensor 20 may then be installed after curing the coating and the guidewire assembly completed.
  • UV ultraviolet
  • a tip member 30 may be coupled to distal portion 16 .
  • Tip member 30 may include a shaping member 32 and a spring or coil member 34 .
  • a distal tip 36 may be attached to shaping member 32 and/or spring 34 .
  • distal tip 36 may take the form of a solder ball tip.
  • Tip member 30 may be joined to distal portion 16 of tubular member 12 with a bonding member 46 such as a weld. It is contemplated that the tip member 30 may be coupled to the distal portion 16 before or after application of the hydrophobic or hydrophilic coating 74 , 76 , as desired.
  • Tubular member 12 may include a hydrophilic coating 19 .
  • hydrophilic coating 19 may extend along substantially the full length of tubular member 12 .
  • one or more discrete sections of tubular member 12 may include hydrophilic coating 19 .
  • an FFR system that utilizes an optical pressure sensor in a pressure sensing guidewire may be connected to a number of processing/conditioning units, displays, and the like.
  • the various cables/connections may be designed so that the optical signals can be transmitted between adjacent optical fibers in an efficient manner.
  • optical connectors exist that are designed to allow for efficient communication between adjacent optical fibers. Such connectors are typically utilized in industries such as telecommunication.
  • the use of optical fibers in medical devices provides a variety of new challenges.
  • the connectors may need to allow for the connection of various devices and/or components while allowing for movement (e.g., rotation) of the components relative to one another during use. These movements could lead to complications.
  • the polished end surfaces of the fiber could contact one another, which could ultimately scratch, rub, or damage the fibers. This could impact the optical communication between the fibers.
  • At least some of the medical devices, medical device systems, and connectors disclosed herein may include features that improve the connection of components of a fiber optic system such as the connection of optical fibers.
  • the medical device systems may be understood to be one or more medical devices that may be used together.
  • the medical device systems disclosed herein may be systems for measuring FFR. These systems may include a pressure sensing guidewire, an optical connector cable coupled to the guidewire, a signal conditioning unit and/or processing unit coupled to the optical connector cable, and a display unit or output.
  • the systems may also include additional intermediate cables and/or devices, guide catheters, other pressure measuring devices and/or components, and the like. References made to a system are not meant to imply that all of these components are present.
  • the materials that can be used for the various components of guidewire 10 (and/or other guidewires disclosed herein) and the various tubular members disclosed herein may include those commonly associated with medical devices.
  • the following discussion makes reference to tubular member 12 and other components of guidewire 10 .
  • this is not intended to limit the devices and methods described herein, as the discussion may be applied to other similar tubular members and/or components of tubular members or devices disclosed herein.
  • the various components of the devices/systems disclosed herein may include a metal, metal alloy, polymer (some examples of which are disclosed below), a metal-polymer composite, ceramics, combinations thereof, and the like, or other suitable material.
  • suitable metals and metal alloys include stainless steel, such as 304V, 304L, and 316LV stainless steel; mild steel; nickel-titanium alloy such as linear-elastic and/or super-elastic nitinol; other nickel alloys such as nickel-chromium-molybdenum alloys (e.g., UNS: N06625 such as INCONEL® 625, UNS: N06022 such as HASTELLOY® C-22®, UNS: N10276 such as HASTELLOY® C276®, other HASTELLOY® alloys, and the like), nickel-copper alloys (e.g., UNS: N04400 such as MONEL® 400, NICKELVAC® 400, NICORROS® 400, and
  • suitable polymers may include polytetrafluoroethylene (PTFE), ethylene tetrafluoroethylene (ETFE), fluorinated ethylene propylene (FEP), polyoxymethylene (POM, for example, DELRIN® available from DuPont), polyether block ester, polyurethane (for example, Polyurethane 85A), polypropylene (PP), polyvinylchloride (PVC), polyether-ester (for example, ARNITEL® available from DSM Engineering Plastics), ether or ester based copolymers (for example, butylene/poly(alkylene ether) phthalate and/or other polyester elastomers such as HYTREL® available from DuPont), polyamide (for example, DURETHAN® available from Bayer or CRISTAMID® available from Elf Atochem), elastomeric polyamides, block polyamide/ethers, polyether block amide (PEBA, for example available under the trade name PEBAX®), ethylene vinyl acetate

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Cited By (2)

* Cited by examiner, † Cited by third party
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US12527936B2 (en) 2023-12-15 2026-01-20 DeepIn Technologies, LLC Guidewire and medical device including laser cut tube
US12605526B2 (en) 2024-02-15 2026-04-21 DeepIn Technologies, LLC Intravascular medical devices including laser cut tube

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EP3397147A1 (de) 2018-11-07
EP3397147B1 (de) 2024-03-27
CN108697351A (zh) 2018-10-23
JP2019506198A (ja) 2019-03-07
JP6929854B2 (ja) 2021-09-01
US20170182295A1 (en) 2017-06-29
WO2017117033A1 (en) 2017-07-06

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